[tip: x86/core] x86: Sanitize linker script

tip-bot2 for Thomas Gleixner
2022-10-17T14:58:27Z

The following commit has been merged into the x86/core branch of tip:

Commit-ID: 24a9c543d2114d416f84e386c2fa90089bd97e4c
Gitweb: https://git.kernel.org/tip/24a9c543d2114d416f84e386c2fa90089bd97e4c
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Thu, 15 Sep 2022 13:10:46 +02:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Mon, 17 Oct 2022 16:40:57 +02:00

x86: Sanitize linker script

The section ordering in the text section is more than suboptimal:

ALIGN_ENTRY_TEXT_BEGIN
ENTRY_TEXT
ALIGN_ENTRY_TEXT_END
SOFTIRQENTRY_TEXT
STATIC_CALL_TEXT
INDIRECT_THUNK_TEXT

ENTRY_TEXT is in a seperate PMD so it can be mapped into the cpu entry area
when KPTI is enabled. That means the sections after it are also in a
seperate PMD. That's wasteful especially as the indirect thunk text is a
hotpath on retpoline enabled systems and the static call text is fairly hot
on 32bit.

Move the entry text section last so that the other sections share a PMD
with the text before it. This is obviously just best effort and not
guaranteed when the previous text is just at a PMD boundary.

The text section placement needs an overhaul in general. There is e.g. no
point to have debugfs, sysfs, cpuhotplug and other rarely used functions
next to hot path text.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111143.614728935@infradead.org
---
arch/x86/kernel/vmlinux.lds.S | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 15f2905..0e9fc08 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -132,18 +132,19 @@ SECTIONS
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
- ALIGN_ENTRY_TEXT_BEGIN
- ENTRY_TEXT
- ALIGN_ENTRY_TEXT_END
SOFTIRQENTRY_TEXT
- STATIC_CALL_TEXT
- *(.gnu.warning)
-
#ifdef CONFIG_RETPOLINE
__indirect_thunk_start = .;
*(.text.__x86.*)
__indirect_thunk_end = .;
#endif
+ STATIC_CALL_TEXT
+
+ ALIGN_ENTRY_TEXT_BEGIN
+ ENTRY_TEXT
+ ALIGN_ENTRY_TEXT_END
+ *(.gnu.warning)
+
} :text =0xcccc

/* End of text section, which should occupy whole number of pages */