On 11/08/2016 03:10 AM, Michael Ellerman wrote:
Hi Dmitry,
Thanks for the patches.
Dmitry Safonov <dsafonov@xxxxxxxxxxxxx> writes:
Impact: cleanup
I'm not a fan of these "Impact" lines, especially when they're not
correct, ie. this is not a cleanup, a cleanup doesn't change logic.
Rename `rc' variable which doesn't seems to mean anything into
kernel-known `ret'.
'rc' means "Return Code", it's fairly common. I see at least ~8500
"int rc" declarations in the kernel.
Please don't rename variables and change logic in one patch.
Ok, right - just didn't saw `rc' that freq as `ret'.
Will leave the name.
Combine two function returns into one as it's
also easier to read.
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Signed-off-by: Dmitry Safonov <dsafonov@xxxxxxxxxxxxx>
---
arch/powerpc/kernel/vdso.c | 19 +++++++------------
1 file changed, 7 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 4111d30badfa..4ffb82a2d9e9 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -154,7 +154,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
struct page **vdso_pagelist;
unsigned long vdso_pages;
unsigned long vdso_base;
- int rc;
+ int ret = 0;
Please don't initialise return codes in the declaration, it prevents the
compiler from warning you if you forget to initialise it in a
particular path.
AFAICS you never even use the default value either.
Oh, right - I split this patch from converting install_special_mapping()
to special vma version _install_special_mapping(), 6/8 patch in series.
Will move initialization to that patch.
if (!vdso_ready)
return 0;
@@ -203,8 +203,8 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
((VDSO_ALIGNMENT - 1) & PAGE_MASK),
0, 0);
if (IS_ERR_VALUE(vdso_base)) {
- rc = vdso_base;
- goto fail_mmapsem;
+ ret = vdso_base;
+ goto out_up_mmap_sem;
}
/* Add required alignment. */
@@ -227,21 +227,16 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
* It's fine to use that for setting breakpoints in the vDSO code
* pages though.
*/
- rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
+ ret = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
VM_READ|VM_EXEC|
VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
vdso_pagelist);
- if (rc) {
+ if (ret)
current->mm->context.vdso_base = 0;
- goto fail_mmapsem;
- }
-
- up_write(&mm->mmap_sem);
- return 0;
- fail_mmapsem:
+out_up_mmap_sem:
up_write(&mm->mmap_sem);
- return rc;
+ return ret;
}
If you strip out the variable renames then I think that change would be
OK.
cheers
--
Dmitry
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