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Date: Fri, 24 Feb 2017 17:24:52 -0800 From: Stephen Boyd <stephen.boyd@...aro.org> To: Arnd Bergmann <arnd@...db.de> Cc: linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org, Luc Van Oostenryck <luc.vanoostenryck@...il.com> Subject: Re: [PATCH] asm-generic: Force cast get_user() setting x to 0 Quoting Stephen Boyd (2017-02-17 08:52:29) > If we call get_user() with an __le* or __be* type sparse will > complain when we assign the result to 0 on the faulting path. > Let's force cast here so that sparse doesn't complain. This > mirrors what we do in __get_user() as well. > > Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org> > --- > > I made a similar fix to arm64 headers, and it looks like asm-generic > would need the same fix. I suppose we can ignore this. I was using sparse v0.5.0 but it seems that later versions of sparse don't complain here anymore as Luc has pointed out. -Stephen > > include/asm-generic/uaccess.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h > index cc6bb319e464..6352d61df7eb 100644 > --- a/include/asm-generic/uaccess.h > +++ b/include/asm-generic/uaccess.h > @@ -227,7 +227,7 @@ extern int __put_user_bad(void) __attribute__((noreturn)); > might_fault(); \ > access_ok(VERIFY_READ, __p, sizeof(*ptr)) ? \ > __get_user((x), (__typeof__(*(ptr)) *)__p) : \ > - ((x) = (__typeof__(*(ptr)))0,-EFAULT); \ > + ((x) = (__force __typeof__(*(ptr)))0, -EFAULT); \ > }) > > #ifndef __get_user_fn
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