From: Florian Fainelli <f.fainelli@gmail.com>
To: linux-arm-kernel@vger.kernel.org
Cc: Florian Fainelli <f.fainelli@gmail.com>,
ard.biesheuvel@linaro.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
open list <linux-kernel@vger.kernel.org>,
bcm-kernel-feedback-list@Broadcom.com,
"moderated list:ARM64 PORT AARCH64 ARCHITECTURE"
<linux-arm-kernel@lists.infradead.org>
Subject: [PATCH] arm64: Allow user selection of ARM64_MODULE_PLTS
Date: Thu, 13 Jun 2019 19:59:32 -0700 [thread overview]
Message-ID: <20190614025932.533-1-f.fainelli@gmail.com> (raw)
Make ARM64_MODULE_PLTS a selectable Kconfig symbol, since some people
might have very big modules spilling out of the dedicated module area
into vmalloc. Help text is copied from the ARM 32-bit counterpart.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
arch/arm64/Kconfig | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 697ea0510729..36befe987b73 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1418,8 +1418,20 @@ config ARM64_SVE
KVM in the same kernel image.
config ARM64_MODULE_PLTS
- bool
+ bool "Use PLTs to allow module memory to spill over into vmalloc area"
select HAVE_MOD_ARCH_SPECIFIC
+ help
+ Allocate PLTs when loading modules so that jumps and calls whose
+ targets are too far away for their relative offsets to be encoded
+ in the instructions themselves can be bounced via veneers in the
+ module's PLT. This allows modules to be allocated in the generic
+ vmalloc area after the dedicated module memory area has been
+ exhausted. The modules will use slightly more memory, but after
+ rounding up to page size, the actual memory footprint is usually
+ the same.
+
+ Disabling this is usually safe for small single-platform
+ configurations. If unsure, say y.
config ARM64_PSEUDO_NMI
bool "Support for NMI-like interrupts"
--
2.17.1
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next reply other threads:[~2019-06-14 2:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-14 2:59 Florian Fainelli [this message]
2019-06-14 7:02 ` [PATCH] arm64: Allow user selection of ARM64_MODULE_PLTS Ard Biesheuvel
2019-06-17 17:32 ` Will Deacon
2019-06-17 18:03 ` Florian Fainelli
2019-06-17 18:10 ` Will Deacon
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