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modules: don't hand 0 to vmalloc.

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In commit d0a21265df David Rientjes unified various archs'
module_alloc implementation (including x86) and removed the graduitous
shortcut for size == 0.

Then, in commit de7d2b567d, Joe Perches added a warning for
zero-length vmallocs, which can happen without kallsyms on modules
with no init sections (eg. zlib_deflate).

Fix this once and for all; the module code has to handle zero length
anyway, so get it right at the caller and remove the now-gratuitous
checks within the arch-specific module_alloc implementations.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=42608
Reported-by: Conrad Kostecki <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joe Perches <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
This commit is contained in:
Rusty Russell 2012-12-11 09:38:33 +10:30
commit 82fab442f5
6 changed files with 18 additions and 28 deletions
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2
arch/tile/kernel/module.c
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@ -42,8 +42,6 @@ void *module_alloc(unsigned long size)
int i = 0;
int npages;
if (size == 0)
return NULL;
npages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
pages = kmalloc(npages * sizeof(struct page *), GFP_KERNEL);
if (pages == NULL)