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Message-Id: <1473947349-14521-4-git-send-email-mark.rutland@arm.com>
Date: Thu, 15 Sep 2016 14:49:04 +0100
From: Mark Rutland <mark.rutland@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: akpm@...ux-foundation.org,
ard.biesheuvel@...aro.org,
catalin.marinas@....com,
james.morse@....com,
keescook@...omium.org,
linux-kernel@...r.kernel.org,
lorenzo.pieralisi@....com,
luto@...nel.org,
mark.rutland@....com,
suzuki.poulose@....com,
takahiro.akashi@...aro.org,
will.deacon@....com,
kernel-hardening@...ts.openwall.com
Subject: [RFC PATCH 3/8] arm64: thread_info remove stale items
We have a comment claiming __switch_to() cares about where cpu_context
is located relative to cpu_domain in thread_info. However arm64 has
never had a thread_info::cpu_domain field, and neither __switch_to nor
cpu_switch_to care where the cpu_context field is relative to others.
Additionally, the init_thread_info alias is never used anywhere in the
kernel, and will shortly become problematic when thread_info is moved
into task_struct.
This patch removes both.
Signed-off-by: Mark Rutland <mark.rutland@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: James Morse <james.morse@....com>
Cc: Will Deacon <will.deacon@....com>
---
arch/arm64/include/asm/thread_info.h | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index abd64bd..796af24 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -42,7 +42,6 @@ typedef unsigned long mm_segment_t;
/*
* low level task data that entry.S needs immediate access to.
- * __switch_to() assumes cpu_context follows immediately after cpu_domain.
*/
struct thread_info {
unsigned long flags; /* low level flags */
@@ -60,7 +59,6 @@ struct thread_info {
.addr_limit = KERNEL_DS, \
}
-#define init_thread_info (init_thread_union.thread_info)
#define init_stack (init_thread_union.stack)
/*
--
1.9.1
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