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Date: Mon, 20 Apr 2020 13:33:22 +0800
From: kbuild test robot <lkp@...el.com>
To: Bernard Zhao <bernard@...o.com>,
Christoph Lameter <cl@...ux-foundation.org>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, kernel@...o.com
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
Linux Memory Management List <linux-mm@...ck.org>,
kernel@...o.com
Subject: Re: [PATCH] kmalloc_index optimization(code size & runtime stable)
Hi Bernard,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v5.7-rc1 next-20200416]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
url: https://github.com/0day-ci/linux/commits/Bernard-Zhao/kmalloc_index-optimization-code-size-runtime-stable/20200417-100445
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2fcd80144b93ff90836a44f2054b4d82133d3a85
config: powerpc-defconfig (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 40d139c620f83509fe18acbff5ec358298e99def)
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install powerpc cross compiling tool for clang build
# apt-get install binutils-powerpc-linux-gnu
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc
If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:15:
In file included from include/linux/socket.h:8:
In file included from include/linux/uio.h:10:
In file included from include/crypto/hash.h:11:
In file included from include/linux/crypto.h:19:
>> include/linux/slab.h:390:3: error: use of undeclared identifier 'high_bit'
high_bit = fls((int)size);
^
include/linux/slab.h:392:22: error: use of undeclared identifier 'high_bit'
if (size == (2 << (high_bit - KMALLOC_SIZE_POW_2_SHIFT_BIT)))
^
include/linux/slab.h:393:12: error: use of undeclared identifier 'high_bit'
return (high_bit - KMALLOC_SIZE_POW_2_INDEX_BIT);
^
include/linux/slab.h:395:10: error: use of undeclared identifier 'high_bit'
return high_bit;
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:17:
In file included from include/linux/fs.h:34:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:87:11: warning: array index 3 is past the end of the array (which contains 1 element) [-Warray-bounds]
return (set->sig[3] | set->sig[2] |
^ ~
arch/powerpc/include/uapi/asm/signal.h:18:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:17:
In file included from include/linux/fs.h:34:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:87:25: warning: array index 2 is past the end of the array (which contains 1 element) [-Warray-bounds]
return (set->sig[3] | set->sig[2] |
^ ~
arch/powerpc/include/uapi/asm/signal.h:18:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:17:
In file included from include/linux/fs.h:34:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:88:4: warning: array index 1 is past the end of the array (which contains 1 element) [-Warray-bounds]
set->sig[1] | set->sig[0]) == 0;
^ ~
arch/powerpc/include/uapi/asm/signal.h:18:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:17:
In file included from include/linux/fs.h:34:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:90:11: warning: array index 1 is past the end of the array (which contains 1 element) [-Warray-bounds]
return (set->sig[1] | set->sig[0]) == 0;
^ ~
arch/powerpc/include/uapi/asm/signal.h:18:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:17:
In file included from include/linux/fs.h:34:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:103:11: warning: array index 3 is past the end of the array (which contains 1 element) [-Warray-bounds]
return (set1->sig[3] == set2->sig[3]) &&
^ ~
arch/powerpc/include/uapi/asm/signal.h:18:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:17:
In file included from include/linux/fs.h:34:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:103:27: warning: array index 3 is past the end of the array (which contains 1 element) [-Warray-bounds]
return (set1->sig[3] == set2->sig[3]) &&
^ ~
arch/powerpc/include/uapi/asm/signal.h:18:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:17:
In file included from include/linux/fs.h:34:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
In file included from include/linux/sched/signal.h:6:
include/linux/signal.h:104:5: warning: array index 2 is past the end of the array (which contains 1 element) [-Warray-bounds]
(set1->sig[2] == set2->sig[2]) &&
^ ~
arch/powerpc/include/uapi/asm/signal.h:18:2: note: array 'sig' declared here
unsigned long sig[_NSIG_WORDS];
^
In file included from arch/powerpc/kernel/asm-offsets.c:14:
In file included from include/linux/compat.h:17:
In file included from include/linux/fs.h:34:
In file included from include/linux/percpu-rwsem.h:7:
In file included from include/linux/rcuwait.h:6:
vim +/high_bit +390 include/linux/slab.h
356
357 /*
358 * Figure out which kmalloc slab an allocation of a certain size
359 * belongs to.
360 * 0 = zero alloc
361 * 1 = 65 .. 96 bytes
362 * 2 = 129 .. 192 bytes
363 * n = 2^(n-1)+1 .. 2^n
364 */
365 static __always_inline unsigned int kmalloc_index(size_t size)
366 {
367 if (!size)
368 return 0;
369
370 if (size <= KMALLOC_MIN_SIZE)
371 return KMALLOC_SHIFT_LOW;
372
373 if (KMALLOC_MIN_SIZE <= 32 && size > 64 && size <= 96)
374 return 1;
375 if (KMALLOC_MIN_SIZE <= 64 && size > 128 && size <= 192)
376 return 2;
377
378 if (size <= 8)
379 return 3;
380
381 /* size over KMALLOC_MAX_SIZE should trigger BUG */
382 if (size <= KMALLOC_MAX_SIZE) {
383 /*
384 * kmalloc_info[index]
385 * size 8----16----32----64----128---256---512---1024---2048.
386 * | | | | | | | | | | | | | | | | |
387 * index 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11
388 */
389
> 390 high_bit = fls((int)size);
391
392 if (size == (2 << (high_bit - KMALLOC_SIZE_POW_2_SHIFT_BIT)))
393 return (high_bit - KMALLOC_SIZE_POW_2_INDEX_BIT);
394
395 return high_bit;
396 }
397
398 BUG();
399
400 /* Will never be reached. Needed because the compiler may complain */
401 return -1;
402 }
403 #endif /* !CONFIG_SLOB */
404
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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