/*
 * asm-generic/int-ll64.h
 *
 * Integer declarations for architectures which use "long long"
 * for 64-bit types.
 */

#ifndef _UAPI_ASM_GENERIC_INT_LL64_H
#define _UAPI_ASM_GENERIC_INT_LL64_H

#include <asm/bitsperlong.h>

#ifndef __ASSEMBLY__
/*
 * __xx is ok: it doesn't pollute the POSIX namespace. Use these in the
 * header files exported to user space
 */

typedef __signed__ char __s8;
typedef unsigned char __u8;

typedef __signed__ short __s16;
typedef unsigned short __u16;

typedef __signed__ int __s32;
typedef unsigned int __u32;

#ifdef __GNUC__
__extension__ typedef __signed__ long long __s64;
__extension__ typedef unsigned long long __u64;
#else
typedef __signed__ long long __s64;
typedef unsigned long long __u64;
#endif

#endif /* __ASSEMBLY__ */


#endif /* _UAPI_ASM_GENERIC_INT_LL64_H */
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<div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=29905b52fad0854351f57bab867647e4982285bf'>Collapse</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr class='logheader'><td><span title='2017-02-03 09:56:43 -0800'>2017-02-03</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=29905b52fad0854351f57bab867647e4982285bf'>log2: make order_base_2() behave correctly on const input value zero</a></td><td>Ard Biesheuvel</td><td>1</td><td><span class='deletions'>-1</span>/<span class='insertions'>+12</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
The function order_base_2() is defined (according to the comment block)
as returning zero on input zero, but subsequently passes the input into
roundup_pow_of_two(), which is explicitly undefined for input zero.

This has gone unnoticed until now, but optimization passes in GCC 7 may
produce constant folded function instances where a constant value of
zero is passed into order_base_2(), resulting in link errors against the
deliberately undefined '____ilog2_NaN'.

So update order_base_2() to adhere to its own documented interface.

[ See

     http://marc.info/?l=linux-kernel&amp;m=147672952517795&amp;w=2

  and follow-up discussion for more background. The gcc "optimization
  pass" is really just broken, but now the GCC trunk problem seems to
  have escaped out of just specially built daily images, so we need to
  work around it in mainline.    - Linus ]

Signed-off-by: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;


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<tr class='logheader'><td><span title='2017-02-02 14:08:58 -0800'>2017-02-02</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=34e00accf612bc5448ae709245c2b408edf39f46'>Merge branch 'x86-urgent-for-linus' of ↵</a></td><td>Linus Torvalds