Messages in this thread | | | Date | Fri, 27 Nov 2015 10:31:25 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH] x86, mtrr: mark range_new in mtrr_calc_range_state() as __initdata |
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* Rasmus Villemoes <linux@rasmusvillemoes.dk> wrote:
> range_new doesn't seem to be used after init. It is only passed to > memset, sum_ranges, memcmp and x86_get_mtrr_mem_range, the latter of > which also only passes it on to various *range* library functions. So > mark it __initdata to free up an extra page after init. > > nr_range_new is unconditionally assigned to before it is read, so > there's no point in having it static. > > Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> > --- > arch/x86/kernel/cpu/mtrr/cleanup.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/kernel/cpu/mtrr/cleanup.c b/arch/x86/kernel/cpu/mtrr/cleanup.c > index 70d7c93f4550..b1a9ad366f67 100644 > --- a/arch/x86/kernel/cpu/mtrr/cleanup.c > +++ b/arch/x86/kernel/cpu/mtrr/cleanup.c > @@ -593,9 +593,9 @@ mtrr_calc_range_state(u64 chunk_size, u64 gran_size, > unsigned long x_remove_base, > unsigned long x_remove_size, int i) > { > - static struct range range_new[RANGE_NUM]; > + static struct range range_new[RANGE_NUM] __initdata; > unsigned long range_sums_new; > - static int nr_range_new; > + int nr_range_new; > int num_reg; > > /* Convert ranges to var ranges state: */
So this static variable actually surprised me - I never realized it was there - and it's not some simple 'once' flag, but something that is essential semantics.
So marking it __initdata is correct, but please also move it out of function local variables scope, into file scope - and name it properly as well, like mtrr_new_range[] or so?
Thanks,
Ingo
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