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iommu/io-pgtable: Move some initialization data to .init.rodata 

The memory used by '__init' functions can be freed once the initialization
phase has been performed.

Mark some 'static const' array defined and used within some '__init'
functions as '__initconst', so that the corresponding data can also be
discarded.

Without '__initconst', the data are put in the .rodata section.
With the qualifier, they are put in the .init.rodata section.

With gcc 8.3.0, the following changes have been measured:

Without '__initconst':
   section      size
  .rodata       00000720
  .init.rodata  00000018

With '__initconst':
   section      size
  .rodata       00000660
  .init.rodata  00000058

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Christophe JAILLET 2019-09-09 22:19:19 +02:00 committed by Will Deacon
parent 931a0ba638
commit 9062c1d0be
1 changed files with 3 additions and 3 deletions
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6
drivers/iommu/io-pgtable-arm.c
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@ -1113,7 +1113,7 @@ static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops)
static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
{
static const enum io_pgtable_fmt fmts[] = {
static const enum io_pgtable_fmt fmts[] __initconst = {
ARM_64_LPAE_S1,
ARM_64_LPAE_S2,
};
@ -1212,13 +1212,13 @@ static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
static int __init arm_lpae_do_selftests(void)
{
static const unsigned long pgsize[] = {
static const unsigned long pgsize[] __initconst = {
SZ_4K | SZ_2M | SZ_1G,
SZ_16K | SZ_32M,
SZ_64K | SZ_512M,
};
static const unsigned int ias[] = {
static const unsigned int ias[] __initconst = {
32, 36, 40, 42, 44, 48,
};