/* * linux/arch/arm/lib/io-readsl.S * * Copyright (C) 1995-2000 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include ENTRY(__raw_readsl) teq r2, #0 @ do we have to check for the zero len? reteq lr ands ip, r1, #3 bne 3f subs r2, r2, #4 bmi 2f stmfd sp!, {r4, lr} 1: ldr r3, [r0, #0] ldr r4, [r0, #0] ldr ip, [r0, #0] ldr lr, [r0, #0] subs r2, r2, #4 stmia r1!, {r3, r4, ip, lr} bpl 1b ldmfd sp!, {r4, lr} 2: movs r2, r2, lsl #31 ldrcs r3, [r0, #0] ldrcs ip, [r0, #0] stmcsia r1!, {r3, ip} ldrne r3, [r0, #0] strne r3, [r1, #0] ret lr 3: ldr r3, [r0] cmp ip, #2 mov ip, r3, get_byte_0 strb ip, [r1], #1 bgt 6f mov ip, r3, get_byte_1 strb ip, [r1], #1 beq 5f mov ip, r3, get_byte_2 strb ip, [r1], #1 4: subs r2, r2, #1 mov ip, r3, lspull #24 ldrne r3, [r0] orrne ip, ip, r3, lspush #8 strne ip, [r1], #4 bne 4b b 8f 5: subs r2, r2, #1 mov ip, r3, lspull #16 ldrne r3, [r0] orrne ip, ip, r3, lspush #16 strne ip, [r1], #4 bne 5b b 7f 6: subs r2, r2, #1 mov ip, r3, lspull #8 ldrne r3, [r0] orrne ip, ip, r3, lspush #24 strne ip, [r1], #4 bne 6b mov r3, ip, get_byte_2 strb r3, [r1, #2] 7: mov r3, ip, get_byte_1 strb r3, [r1, #1] 8: mov r3, ip, get_byte_0 strb r3, [r1, #0] ret lr ENDPROC(__raw_readsl) class='sub right'>Tobias Klauser
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authorTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
committerTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
commit07cd12945551b63ecb1a349d50a6d69d1d6feb4a (patch)
tree75f65eba7eac9277971082a2d5a4cf1370562c0c /tools/build/feature/test-libperl.c
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
cgroup: don't online subsystems before cgroup_name/path() are operational
While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems before the new cgroup is associated with it kernfs_node. This is fine for cgroup proper but cgroup_name/path() depend on the associated kernfs_node and if a subsystem makes the new cgroup_subsys_state visible, which they're allowed to after onlining, it can lead to NULL dereference. The current code performs cgroup creation and subsystem onlining in cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems visible afterwards. There's no reason to online the subsystems early and we can simply drop cgroup_apply_control_enable() call from cgroup_create() so that the subsystems are onlined and made visible at the same time. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") Cc: stable@vger.kernel.org # v4.6+
Diffstat (limited to 'tools/build/feature/test-libperl.c')