Subject: + procfs-also-fix-proc_reg_get_unmapped_area-for-mmu-case.patch added
to -mm tree
To:
[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
From: [email protected]
Date: Mon, 25 Nov 2013 14:13:43 -0800
The patch titled
Subject: procfs: also fix proc_reg_get_unmapped_area() for !MMU case
has been added to the -mm tree. Its filename is
procfs-also-fix-proc_reg_get_unmapped_area-for-mmu-case.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/procfs-also-fix-proc_reg_get_unmapped_area-for-mmu-case.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/procfs-also-fix-proc_reg_get_unmapped_area-for-mmu-case.patch
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------------------------------------------------------
From: "Jan Beulich" <[email protected]>
Subject: procfs: also fix proc_reg_get_unmapped_area() for !MMU case
Commit fad1a86e ("procfs: call default get_unmapped_area on MMU-present
architectures"), as its title says, took care of only the MMU case,
leaving the !MMU side still in the regressed state (returning -EIO in all
cases where pde->proc_fops->get_unmapped_area is NULL).
>From the fad1a86e changelog:
: Commit c4fe24485729 ("sparc: fix PCI device proc file mmap(2)") added
: proc_reg_get_unmapped_area in proc_reg_file_ops and
: proc_reg_file_ops_no_compat, by which now mmap always returns EIO if
: get_unmapped_area method is not defined for the target procfs file, which
: causes regression of mmap on /proc/vmcore.
:
: To address this issue, like get_unmapped_area(), call default
: current->mm->get_unmapped_area on MMU-present architectures if
: pde->proc_fops->get_unmapped_area, i.e. the one in actual file operation
: in the procfs file, is not defined.
Signed-off-by: Jan Beulich <[email protected]>
Cc: HATAYAMA Daisuke <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: <[email protected]> [3.12.x]
Signed-off-by: Andrew Morton <[email protected]>
---
fs/proc/inode.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff -puN
fs/proc/inode.c~procfs-also-fix-proc_reg_get_unmapped_area-for-mmu-case
fs/proc/inode.c
--- a/fs/proc/inode.c~procfs-also-fix-proc_reg_get_unmapped_area-for-mmu-case
+++ a/fs/proc/inode.c
@@ -292,16 +292,19 @@ proc_reg_get_unmapped_area(struct file *
{
struct proc_dir_entry *pde = PDE(file_inode(file));
unsigned long rv = -EIO;
- unsigned long (*get_area)(struct file *, unsigned long, unsigned long,
- unsigned long, unsigned long) = NULL;
+
if (use_pde(pde)) {
+ typeof(proc_reg_get_unmapped_area) *get_area
#ifdef CONFIG_MMU
- get_area = current->mm->get_unmapped_area;
+ = pde->proc_fops->get_unmapped_area
+ ?: current->mm->get_unmapped_area;
+#else
+ = pde->proc_fops->get_unmapped_area;
#endif
- if (pde->proc_fops->get_unmapped_area)
- get_area = pde->proc_fops->get_unmapped_area;
- if (get_area)
- rv = get_area(file, orig_addr, len, pgoff, flags);
+
+ rv = get_area
+ ? get_area(file, orig_addr, len, pgoff, flags)
+ : orig_addr;
unuse_pde(pde);
}
return rv;
_
Patches currently in -mm which might be from [email protected] are
procfs-also-fix-proc_reg_get_unmapped_area-for-mmu-case.patch
lib-decompress_unlz4c-always-set-an-error-return-code-on-failures.patch
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