mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-06 01:26:56 +01:00
Stephen Boyd
446f24d119
The help text for this config is duplicated across the x86, parisc, and s390 Kconfig.debug files. Arnd Bergman noted that the help text was slightly misleading and should be fixed to state that enabling this option isn't a problem when using pre 4.4 gcc. To simplify the rewording, consolidate the text into lib/Kconfig.debug and modify it there to be more explicit about when you should say N to this config. Also, make the text a bit more generic by stating that this option enables compile time checks so we can cover architectures which emit warnings vs. ones which emit errors. The details of how an architecture decided to implement the checks isn't as important as the concept of compile time checking of copy_from_user() calls. While we're doing this, remove all the copy_from_user_overflow() code that's duplicated many times and place it into lib/ so that any architecture supporting this option can get the function for free. Signed-off-by: Stephen Boyd <[email protected]> Acked-by: Arnd Bergmann <[email protected]> Acked-by: Ingo Molnar <[email protected]> Acked-by: H. Peter Anvin <[email protected]> Cc: Arjan van de Ven <[email protected]> Acked-by: Helge Deller <[email protected]> Cc: Heiko Carstens <[email protected]> Cc: Stephen Rothwell <[email protected]> Cc: Chris Metcalf <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
36 lines
1012 B
Plaintext
36 lines
1012 B
Plaintext
menu "Kernel hacking"
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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source "lib/Kconfig.debug"
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config STRICT_DEVMEM
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def_bool y
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prompt "Filter access to /dev/mem"
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---help---
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This option restricts access to /dev/mem. If this option is
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disabled, you allow userspace access to all memory, including
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kernel and userspace memory. Accidental memory access is likely
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to be disastrous.
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Memory access is required for experts who want to debug the kernel.
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If you are unsure, say Y.
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config S390_PTDUMP
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bool "Export kernel pagetable layout to userspace via debugfs"
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depends on DEBUG_KERNEL
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select DEBUG_FS
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---help---
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Say Y here if you want to show the kernel pagetable layout in a
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debugfs file. This information is only useful for kernel developers
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who are working in architecture specific areas of the kernel.
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It is probably not a good idea to enable this feature in a production
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kernel.
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If in doubt, say "N"
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config DEBUG_SET_MODULE_RONX
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def_bool y
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depends on MODULES
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endmenu
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