linux-kernel - Re: [PATCH 1/1] arch/um: fix forward declaration for vmalloc

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Date: Tue, 26 Mar 2024 08:37:24 -0700
From: SeongJae Park <sj@...nel.org>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: SeongJae Park <sj@...nel.org>,
	akpm@...ux-foundation.org,
	sfr@...b.auug.org.au,
	kent.overstreet@...ux.dev,
	richard@....at,
	anton.ivanov@...bridgegreys.com,
	johannes@...solutions.net,
	linux-mm@...ck.org,
	linux-um@...ts.infradead.org,
	linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] arch/um: fix forward declaration for vmalloc

On Tue, 26 Mar 2024 00:37:50 -0700 Suren Baghdasaryan <surenb@...gle.com> wrote:

> Patch [1] replaced vmalloc() function with a new definition but it did
> not adjust the forward declaration used in UML architecture. Change it
> to act as before.
> Note that this prevents the vmalloc() allocations in __wrap_malloc()
> from being accounted. If accounting here is critical, we will have
> to remove this forward declaration and include vmalloc.h, however
> that would pull in more dependencies and would require introducing more
> architecture-specific headers, like asm/bug.h, asm/rwonce.h, etc.
> This is likely the reason why this forward declaration was introduced
> in the first place.
> 
> [1] https://lore.kernel.org/all/20240321163705.3067592-31-surenb@google.com/
> 
> Fixes: 576477564ede ("mm: vmalloc: enable memory allocation profiling")
> Reported-by: SeongJae Park <sj@...nel.org>
> Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>

Thank you for this fix, Suren.  I confirmed that this patch fixes the issue I
reported.

Closes: https://lore.kernel.org/all/20240323180506.195396-1-sj@kernel.org/
Tested-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

> ---
>  arch/um/include/shared/um_malloc.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/um/include/shared/um_malloc.h b/arch/um/include/shared/um_malloc.h
> index 13da93284c2c..bf503658f08e 100644
> --- a/arch/um/include/shared/um_malloc.h
> +++ b/arch/um/include/shared/um_malloc.h
> @@ -11,7 +11,8 @@
>  extern void *uml_kmalloc(int size, int flags);
>  extern void kfree(const void *ptr);
>  
> -extern void *vmalloc(unsigned long size);
> +extern void *vmalloc_noprof(unsigned long size);
> +#define vmalloc(...)		vmalloc_noprof(__VA_ARGS__)
>  extern void vfree(void *ptr);
>  
>  #endif /* __UM_MALLOC_H__ */
> -- 
> 2.44.0.396.g6e790dbe36-goog