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kallsyms and Makefile: add a couple comments #891

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Sep 27, 2022
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kallsyms and Makefile: add a couple comments #891

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8914231
Makefile: add comment to explain `RUSTC_BOOTSTRAP`
ojeda Sep 26, 2022
152d8e8
kallsyms: explain why the `_Static_assert` is needed
ojeda Sep 27, 2022
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1 change: 1 addition & 0 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -593,6 +593,7 @@ ifdef RUST_LIB_SRC
export RUST_LIB_SRC
endif

# Allows the usage of unstable features in stable compilers.
export RUSTC_BOOTSTRAP := 1

export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
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8 changes: 7 additions & 1 deletion scripts/kallsyms.c
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Expand Up @@ -32,7 +32,13 @@

#define KSYM_NAME_LEN 512

/* A substantially bigger size than the current maximum. */
/*
* A substantially bigger size than the current maximum.
*
* It cannot be defined as an expression because it gets stringified
* for the fscanf() format string. Therefore, a _Static_assert() is
* used instead to maintain the relationship with KSYM_NAME_LEN.
*/
#define KSYM_NAME_LEN_BUFFER 2048
_Static_assert(
KSYM_NAME_LEN_BUFFER == KSYM_NAME_LEN * 4,
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