Backport zfs 5.8 compaitibility patch to zfs 0.8.4
Adding this patch makes zfs compile against 5.8-rc7 kernels. Upstream PR: https://github.com/openzfs/zfs/pull/10422 Modifications: - spl_kvmalloc does not exists in zfs 0.8.4 - related code was dropped.
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rtreffer
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@ -0,0 +1,154 @@
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From 6cc95288ccea12ad7b67b2b5b3997dfad8e5b5c9 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Michael=20Niew=C3=B6hner?=
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<c0d3z3r0@users.noreply.github.com>
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Date: Tue, 9 Jun 2020 01:32:02 +0200
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Subject: [PATCH] BACKPORT: Linux 5.8 compat: __vmalloc()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The `pgprot` argument has been removed from `__vmalloc` in Linux 5.8,
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being `PAGE_KERNEL` always now [1].
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Detect this during configure and define a wrapper for older kernels.
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[1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/mm/vmalloc.c?h=next-20200605&id=88dca4ca5a93d2c09e5bbc6a62fbfc3af83c4fca
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Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
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Co-authored-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
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Co-authored-by: Michael Niewöhner <foss@mniewoehner.de>
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Signed-off-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
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Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
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Closes #10422
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---
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config/kernel-kmem.m4 | 26 ++++++++++++++++++++++++++
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config/kernel.m4 | 2 ++
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include/spl/sys/kmem.h | 9 +++++++++
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module/spl/spl-kmem-cache.c | 4 ++--
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module/spl/spl-kmem.c | 9 ++++-----
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5 files changed, 43 insertions(+), 7 deletions(-)
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diff --git a/config/kernel-kmem.m4 b/config/kernel-kmem.m4
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index cc055e530..f1c0d2412 100644
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--- a/config/kernel-kmem.m4
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+++ b/config/kernel-kmem.m4
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@@ -56,3 +56,29 @@ AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
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AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
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AC_MSG_RESULT([$enable_debug_kmem_tracking])
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])
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+
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+dnl #
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+dnl # 5.8 API,
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+dnl # __vmalloc PAGE_KERNEL removal
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+dnl #
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+AC_DEFUN([ZFS_AC_KERNEL_SRC_VMALLOC_PAGE_KERNEL], [
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+ ZFS_LINUX_TEST_SRC([__vmalloc], [
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+ #include <linux/mm.h>
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+ #include <linux/vmalloc.h>
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+ ],[
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+ void *p __attribute__ ((unused));
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+
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+ p = __vmalloc(0, GFP_KERNEL, PAGE_KERNEL);
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+ ])
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+])
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+
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+AC_DEFUN([ZFS_AC_KERNEL_VMALLOC_PAGE_KERNEL], [
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+ AC_MSG_CHECKING([whether __vmalloc(ptr, flags, pageflags) is available])
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+ ZFS_LINUX_TEST_RESULT([__vmalloc], [
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+ AC_MSG_RESULT(yes)
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+ AC_DEFINE(HAVE_VMALLOC_PAGE_KERNEL, 1, [__vmalloc page flags exists])
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+ ],[
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+ AC_MSG_RESULT(no)
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+ ])
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+])
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+-
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diff --git a/config/kernel.m4 b/config/kernel.m4
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index b67fcef8c..23edfdcd8 100644
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--- a/config/kernel.m4
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+++ b/config/kernel.m4
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@@ -45,6 +45,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
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ZFS_AC_KERNEL_SRC_SCHED
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ZFS_AC_KERNEL_SRC_USLEEP_RANGE
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ZFS_AC_KERNEL_SRC_KMEM_CACHE
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+ ZFS_AC_KERNEL_SRC_VMALLOC_PAGE_KERNEL
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ZFS_AC_KERNEL_SRC_WAIT
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ZFS_AC_KERNEL_SRC_INODE_TIMES
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ZFS_AC_KERNEL_SRC_INODE_LOCK
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@@ -163,6 +164,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
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ZFS_AC_KERNEL_SCHED
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ZFS_AC_KERNEL_USLEEP_RANGE
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ZFS_AC_KERNEL_KMEM_CACHE
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+ ZFS_AC_KERNEL_VMALLOC_PAGE_KERNEL
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ZFS_AC_KERNEL_WAIT
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ZFS_AC_KERNEL_INODE_TIMES
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ZFS_AC_KERNEL_INODE_LOCK
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diff --git a/include/spl/sys/kmem.h b/include/spl/sys/kmem.h
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index 72d3a7765..ca15bfe7f 100644
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--- a/include/spl/sys/kmem.h
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+++ b/include/spl/sys/kmem.h
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@@ -169,6 +169,15 @@ extern void *spl_kmem_alloc(size_t sz, int fl, const char *func, int line);
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extern void *spl_kmem_zalloc(size_t sz, int fl, const char *func, int line);
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extern void spl_kmem_free(const void *ptr, size_t sz);
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+/*
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+ * 5.8 API change, pgprot_t argument removed.
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+ */
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+#ifdef HAVE_VMALLOC_PAGE_KERNEL
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+#define spl_vmalloc(size, flags) __vmalloc(size, flags, PAGE_KERNEL)
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+#else
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+#define spl_vmalloc(size, flags) __vmalloc(size, flags)
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+#endif
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+
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/*
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* The following functions are only available for internal use.
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*/
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diff --git a/module/spl/spl-kmem-cache.c b/module/spl/spl-kmem-cache.c
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index d71b4b348..4866b2993 100644
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--- a/module/spl/spl-kmem-cache.c
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+++ b/module/spl/spl-kmem-cache.c
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@@ -203,7 +203,7 @@ kv_alloc(spl_kmem_cache_t *skc, int size, int flags)
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ASSERT(ISP2(size));
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ptr = (void *)__get_free_pages(lflags, get_order(size));
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} else {
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- ptr = __vmalloc(size, lflags | __GFP_HIGHMEM, PAGE_KERNEL);
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+ ptr = spl_vmalloc(size, lflags | __GFP_HIGHMEM);
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}
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/* Resulting allocated memory will be page aligned */
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@@ -1242,7 +1242,7 @@ spl_cache_grow(spl_kmem_cache_t *skc, int flags, void **obj)
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* allocation.
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*
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* However, this can't be applied to KVM_VMEM due to a bug that
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- * __vmalloc() doesn't honor gfp flags in page table allocation.
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+ * spl_vmalloc() doesn't honor gfp flags in page table allocation.
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*/
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if (!(skc->skc_flags & KMC_VMEM)) {
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rc = __spl_cache_grow(skc, flags | KM_NOSLEEP);
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diff --git a/module/spl/spl-kmem.c b/module/spl/spl-kmem.c
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index cee69ad43..ca1fc145f 100644
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--- a/module/spl/spl-kmem.c
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+++ b/module/spl/spl-kmem.c
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@@ -172,16 +172,15 @@ spl_kmem_alloc_impl(size_t size, int flags, int node)
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* kmem_zalloc() callers.
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*
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* For vmem_alloc() and vmem_zalloc() callers it is permissible
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- * to use __vmalloc(). However, in general use of __vmalloc()
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- * is strongly discouraged because a global lock must be
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- * acquired. Contention on this lock can significantly
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+ * to use spl_vmalloc(). However, in general use of
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+ * spl_vmalloc() is strongly discouraged because a global lock
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+ * must be acquired. Contention on this lock can significantly
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* impact performance so frequently manipulating the virtual
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* address space is strongly discouraged.
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*/
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if ((size > spl_kmem_alloc_max) || use_vmem) {
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if (flags & KM_VMEM) {
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- ptr = __vmalloc(size, lflags | __GFP_HIGHMEM,
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- PAGE_KERNEL);
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+ ptr = spl_vmalloc(size, lflags | __GFP_HIGHMEM);
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} else {
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return (NULL);
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}
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--
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2.25.1
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@ -42,7 +42,7 @@ let
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inherit rev sha256;
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};
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patches = [ ] ++ extraPatches;
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patches = [ ./BACKPORT-Linux-5.8-compat-__vmalloc.patch ] ++ extraPatches;
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postPatch = optionalString buildKernel ''
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patchShebangs scripts
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