From: Matt Turner <mattst88@gmail.com>
To: linux-alpha@vger.kernel.org, richard.henderson@linaro.org
Cc: linmag7@gmail.com, linux-kernel@vger.kernel.org
Subject: [PATCH 19/24] alpha: discard .eh_frame and the relocation sections
Date: Tue, 1 Sep 2026 11:50:32 -0400 [thread overview]
Message-ID: <7f44a90b0479bc98b15fc5ff4095ed555d33e805.1788277742.git.mattst88@gmail.com> (raw)
In-Reply-To: <cover.1788277742.git.mattst88@gmail.com>
gcc emits .eh_frame for Alpha even though the kernel builds with
-fno-asynchronous-unwind-tables, and nothing in the kernel consumes it:
the stack trace code scans the stack for text addresses rather than
unwinding DWARF. It was allocated in the loaded image, so dropping it
shrinks vmlinux by about 1.1MB for a Marvel SMP configuration.
The .rela* sections are equally useless, as the kernel image is not
relocatable. The linker was already dropping their contents.
Both were being placed as orphan sections, which is what drew attention
to them.
Assisted-by: Claude:claude-opus-5
Signed-off-by: Matt Turner <mattst88@gmail.com>
---
arch/alpha/kernel/vmlinux.lds.S | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git ./arch/alpha/kernel/vmlinux.lds.S ./arch/alpha/kernel/vmlinux.lds.S
index 95704e64b6a6..c44941d3b874 100644
--- ./arch/alpha/kernel/vmlinux.lds.S
+++ ./arch/alpha/kernel/vmlinux.lds.S
@@ -76,5 +76,16 @@ SECTIONS
MODINFO
ELF_DETAILS
+ /*
+ * gcc emits .eh_frame for Alpha even with
+ * -fno-asynchronous-unwind-tables, and the kernel has no DWARF
+ * unwinder to consume it. The relocation sections are likewise
+ * useless as the kernel image is not relocatable.
+ */
+ /DISCARD/ : {
+ *(.eh_frame)
+ *(.rela .rela*)
+ }
+
DISCARDS
}
--
2.54.0
next prev parent reply other threads:[~2026-09-01 15:51 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-01 15:50 [PATCH 00/24] alpha: catch up on architecture Kconfig options Matt Turner
2026-09-01 15:50 ` [PATCH 01/24] alpha: fix arch_irqs_disabled_flags() to treat any raised IPL as disabled Matt Turner
2026-09-01 23:20 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 02/24] alpha: enter hardirq context before looking up the irq descriptor Matt Turner
2026-09-03 22:07 ` Magnus Lindholm
2026-09-05 2:43 ` Matt Turner
2026-09-01 15:50 ` [PATCH 03/24] alpha: select ARCH_HAS_UBSAN Matt Turner
2026-09-01 22:34 ` Magnus Lindholm
2026-09-04 20:31 ` Michael Cree
2026-09-04 23:15 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 04/24] alpha: select ARCH_HAS_GCOV_PROFILE_ALL Matt Turner
2026-09-03 22:35 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 05/24] alpha: select HAVE_DEBUG_KMEMLEAK Matt Turner
2026-09-02 6:01 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 06/24] alpha: select EDAC_SUPPORT Matt Turner
2026-09-01 23:17 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 07/24] alpha: select ARCH_SUPPORTS_ATOMIC_RMW Matt Turner
2026-09-02 6:17 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 08/24] alpha: select ARCH_HAS_FAST_MULTIPLIER Matt Turner
2026-09-02 7:49 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 09/24] alpha: select ARCH_SUPPORTS_INT128 Matt Turner
2026-09-02 8:50 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 10/24] alpha: select HAVE_ARCH_COMPILER_H Matt Turner
2026-09-02 9:11 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 11/24] alpha: select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE Matt Turner
2026-09-02 9:25 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 12/24] alpha: add HAVE_ARCH_THREAD_STRUCT_WHITELIST support Matt Turner
2026-09-02 9:35 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 13/24] alpha: add ARCH_HAS_PTE_SPECIAL support Matt Turner
2026-09-02 9:42 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 14/24] alpha: add ARCH_SUPPORTS_PAGE_TABLE_CHECK support Matt Turner
2026-09-01 22:45 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 15/24] alpha: select ARCH_HAS_DEBUG_VM_PGTABLE Matt Turner
2026-09-03 22:52 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 16/24] alpha: select HAVE_GUP_FAST Matt Turner
2026-09-02 21:09 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 17/24] alpha: select ARCH_USE_MEMTEST Matt Turner
2026-09-02 21:56 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 18/24] alpha: select SYSCTL_EXCEPTION_TRACE Matt Turner
2026-09-02 22:02 ` Magnus Lindholm
2026-09-01 15:50 ` Matt Turner [this message]
2026-09-03 5:18 ` [PATCH 19/24] alpha: discard .eh_frame and the relocation sections Magnus Lindholm
2026-09-01 15:50 ` [PATCH 20/24] alpha: select ARCH_WANT_LD_ORPHAN_WARN Matt Turner
2026-09-03 5:34 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 21/24] alpha: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM Matt Turner
2026-09-03 5:42 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 22/24] alpha: add HAVE_PERF_REGS and HAVE_PERF_USER_STACK_DUMP support Matt Turner
2026-09-03 21:01 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 23/24] alpha: select SPARSE_IRQ Matt Turner
2026-09-03 21:26 ` Magnus Lindholm
2026-09-01 15:50 ` [PATCH 24/24] alpha: add TRACE_IRQFLAGS_SUPPORT Matt Turner
2026-09-03 22:58 ` Magnus Lindholm
2026-09-02 18:53 ` [PATCH 00/24] alpha: catch up on architecture Kconfig options Magnus Lindholm
2026-09-02 18:57 ` Matt Turner
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