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nixpkgs/pkgs/os-specific/linux/zfs/BACKPORT-Linux-5.8-compat-__vmalloc.patch
rtreffer 08566523d8 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.
2020-07-31 21:02:36 +02:00

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