Subject: R: [PATCH] arm64: fix missing include in asm uaccess.h

From: <[email-masked]>
Date: Wed, 11 Nov 2020 02:19:48 +0100

> On Wed, Nov 11, 2020 at 12:58:26AM +0000, Al Viro wrote:
> > On Wed, Nov 11, 2020 at 01:44:38AM +0100, Ansuel Smith wrote:
> > > Fix a compilation error as PF_KTHREAD is defined in linux/sched.h and
> > > this is missing.
> > >
> > > Fixes: df325e05a682 ("arm64: Validate tagged addresses in access_ok()
> > > called from kernel threads")
> > > Signed-off-by: Ansuel Smith <[email-masked]>
> > > ---
> > >  arch/arm64/include/asm/uaccess.h | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/arch/arm64/include/asm/uaccess.h
> b/arch/arm64/include/asm/uaccess.h
> > > index 991dd5f031e4..51a4f63f464a 100644
> > > --- a/arch/arm64/include/asm/uaccess.h
> > > +++ b/arch/arm64/include/asm/uaccess.h
> > > @@ -7,6 +7,8 @@
> > >  #ifndef __ASM_UACCESS_H
> > >  #define __ASM_UACCESS_H
> > >
> > > +#include <linux/sched.h>
> > > +
> > >  #include <asm/alternative.h>
> > >  #include <asm/kernel-pgtable.h>
> > >  #include <asm/sysreg.h>
> >
> > NAK.  The real bug is in arch/arm64/include/asm/asm-prototypes.h -
> > it has no business pulling asm/uaccess.h
> >
> > Just include linux/uaccess.h instead.
> 
> BTW,
> $ grep -n uaccess.h `find -name asm-prototypes.h`
> ./arch/alpha/include/asm/asm-prototypes.h:7:#include <linux/uaccess.h>
> ./arch/arm64/include/asm/asm-prototypes.h:18:#include <asm/uaccess.h>
> ./arch/ia64/include/asm/asm-prototypes.h:12:#include <linux/uaccess.h>
> ./arch/mips/include/asm/asm-prototypes.h:6:#include <linux/uaccess.h>
> ./arch/powerpc/include/asm/asm-prototypes.h:14:#include <linux/uaccess.h>
> ./arch/sparc/include/asm/asm-prototypes.h:9:#include <linux/uaccess.h>
> ./arch/x86/include/asm/asm-prototypes.h:3:#include <linux/uaccess.h>
> 
> Spot the irregularity...
> 
> While we are at it,
> $ git grep -n -w '#.*include.*asm/uaccess.h'
> arch/arm64/include/asm/asm-prototypes.h:18:#include <asm/uaccess.h>
> arch/nds32/math-emu/fpuemu.c:5:#include <asm/uaccess.h>
> arch/powerpc/kvm/book3s_xive_native.c:15:#include <asm/uaccess.h>
> arch/powerpc/mm/book3s64/radix_pgtable.c:30:#include <asm/uaccess.h>
> drivers/s390/net/ctcm_mpc.c:50:#include <linux/uaccess.h>       /* instead
of
> <asm/uaccess.h> ok ? */
> include/linux/uaccess.h:11:#include <asm/uaccess.h>
> 
> The last one is the only such include that should exist; drivers/s390 one
> is obviously a false positive.  And IMO the right thing to do is to
> replace the remaining arch/* instances with includes of linux/uaccess.h.
> 
> All of those are asking for trouble; any change moving e.g. a common
> variant of some primitive into linux/uaccess.h might end up breaking
> those.

Thx for the quick response. I found this error while working on a qcom
driver that
use this include. I can confirm that by using linux/uaccess.h the problem is
solved.

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