Date: Tue, 24 Sep 2019 16:28:35 +0530 From: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com> To: pankaj.bharadiya@...il.com, andriy.shevchenko@...ux.intel.com, kernel-hardening@...ts.openwall.com, keescook@...omium.org, akpm@...ux-foundation.org, mayhs11saini@...il.com, linux-kernel@...r.kernel.org Cc: pankaj.laxminarayan.bharadiya@...el.com Subject: [PATCH 1/5] linux/kernel.h: Add sizeof_member macro At present we have 3 different macros to calculate the size of a member of a struct: - SIZEOF_FIELD - FIELD_SIZEOF - sizeof_field To bring uniformity in entire kernel source tree let's add sizeof_member macro. Replace all occurrences of above 3 macro's with sizeof_member in future patches. Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com> --- include/linux/kernel.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 4fa360a13c1e..0b80d8bb3978 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -79,6 +79,15 @@ */ #define round_down(x, y) ((x) & ~__round_mask(x, y)) +/** + * sizeof_member - get the size of a struct's member + * @T: the target struct + * @m: the target struct's member + * Return: the size of @m in the struct definition without having a + * declared instance of @T. + */ +#define sizeof_member(T, m) (sizeof(((T *)0)->m)) + /** * FIELD_SIZEOF - get the size of a struct's field * @t: the target struct -- 2.17.1
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