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Mon, 31 Jul 2017 14:48:36 +0000 From: Yury Norov To: Pratyush Anand , Catalin Marinas , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH RFC] arm64: introduce mm_context_t flags Date: Mon, 31 Jul 2017 17:48:25 +0300 Message-Id: <20170731144825.31322-1-ynorov@caviumnetworks.com> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 X-Originating-IP: [105.155.184.164] X-ClientProxiedBy: AM5PR0402CA0001.eurprd04.prod.outlook.com (10.175.37.11) To BN4PR07MB2116.namprd07.prod.outlook.com (10.164.62.158) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: d6298539-db81-4c0b-7dd0-08d4d82339f0 X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(300000500095)(300135000095)(300000501095)(300135300095)(22001)(300000502095)(300135100095)(2017030254152)(300000503095)(300135400095)(201703131423075)(201703031133081)(201702281549075)(300000504095)(300135200095)(300000505095)(300135600095)(300000506095)(300135500095); SRVR:BN4PR07MB2116; X-Microsoft-Exchange-Diagnostics: 1; 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It looks hacky to me for three reasons: - The flag is introduced for the case where it's impossible to get the thread info structure for the thread associated with mm. So thread_info flags (TIF) may also be unavailable at place. This is not the case for the only existing user of if - uprobes, but in general this approach requires to include thread headers in mm code, which may become unwanted dependency. - New flag, if it uses TIF bits, for consistency should for example set/clear TIF_32BIT_AARCH64 for ILP32 tasks. And to be completely consistent, with current approach we'd mirror thread_info flags to mm_context flags. And keep it syncronized. - If we start using TIF flags here, we cannot easily add new mm_context specific bits because they may mess with TIF ones. I think that this is not what was intended when you added new field in mm_context_t. In this patch the MMCF_AARCH32 flag is introduced, where MMCF prefix stands for mm_context_t flags. And the new flag is used for uprobes code instead of TIF_32BIT. Yury Signed-off-by: Yury Norov --- arch/arm64/include/asm/elf.h | 4 ++-- arch/arm64/include/asm/mmu.h | 2 ++ arch/arm64/kernel/probes/uprobes.c | 2 +- 3 files changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/elf.h b/arch/arm64/include/asm/elf.h index acae781f7359..de11ed1484e3 100644 --- a/arch/arm64/include/asm/elf.h +++ b/arch/arm64/include/asm/elf.h @@ -139,7 +139,7 @@ typedef struct user_fpsimd_state elf_fpregset_t; #define SET_PERSONALITY(ex) \ ({ \ - clear_bit(TIF_32BIT, ¤t->mm->context.flags); \ + clear_bit(MMCF_AARCH32, ¤t->mm->context.flags); \ clear_thread_flag(TIF_32BIT); \ current->personality &= ~READ_IMPLIES_EXEC; \ }) @@ -195,7 +195,7 @@ typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG]; */ #define COMPAT_SET_PERSONALITY(ex) \ ({ \ - set_bit(TIF_32BIT, ¤t->mm->context.flags); \ + set_bit(MMCF_AARCH32, ¤t->mm->context.flags); \ set_thread_flag(TIF_32BIT); \ }) #define COMPAT_ARCH_DLINFO diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h index 5468c834b072..3ae24ed11ae3 100644 --- a/arch/arm64/include/asm/mmu.h +++ b/arch/arm64/include/asm/mmu.h @@ -16,6 +16,8 @@ #ifndef __ASM_MMU_H #define __ASM_MMU_H +#define MMCF_AARCH32 0x1 + typedef struct { atomic64_t id; void *vdso; diff --git a/arch/arm64/kernel/probes/uprobes.c b/arch/arm64/kernel/probes/uprobes.c index 26c998534dca..f29ef6b297e4 100644 --- a/arch/arm64/kernel/probes/uprobes.c +++ b/arch/arm64/kernel/probes/uprobes.c @@ -40,7 +40,7 @@ int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, probe_opcode_t insn; /* TODO: Currently we do not support AARCH32 instruction probing */ - if (test_bit(TIF_32BIT, &mm->context.flags)) + if (test_bit(MMCF_AARCH32, &mm->context.flags)) return -ENOTSUPP; else if (!IS_ALIGNED(addr, AARCH64_INSN_SIZE)) return -EINVAL;