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ANDROID: 16K: Init page_shift param in a pure_initcall()

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Previously, page_shift_compat_enabled was initialized in the
early_param() function for page_shift. However, if page_shift
is passed as a bootconfig, page_shift_compat_enabled is not
initialized because it is too late.

In order to initialized page_shift_compat_enabled when
page_shift is passed as a kernel command line or bootconfig
parameter, a pure_initcall() will be used.

Bug: 376901009
Test: atest Vts16KPageSizeTest
Change-Id: I8127566062c5e0177636f2164a29801a0579ac51
Signed-off-by: Juan Yescas <jyescas@google.com>
This commit is contained in:
Juan Yescas
2024-11-15 20:35:01 -08:00
committed by Carlos Llamas
parent 68ba0f4dfb
commit 44a6882cc7
1 changed files with 21 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
mm/page_size_compat.c
+21 -3
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@@ -10,6 +10,7 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/kstrtox.h> #include <linux/kstrtox.h>
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/pagemap.h> #include <linux/pagemap.h>
#include <linux/page_size_compat.h> #include <linux/page_size_compat.h>
#include <linux/swap.h> #include <linux/swap.h>
@@ -25,11 +26,15 @@ EXPORT_SYMBOL_GPL(page_shift_compat_enabled);
int page_shift_compat __ro_after_init = MIN_PAGE_SHIFT_COMPAT; int page_shift_compat __ro_after_init = MIN_PAGE_SHIFT_COMPAT;
EXPORT_SYMBOL_GPL(page_shift_compat); EXPORT_SYMBOL_GPL(page_shift_compat);
static int __init early_page_shift_compat(char *buf) static int __init page_shift_params(char *param, char *val,
const char *unused, void *arg)
{ {
int ret; int ret;
ret = kstrtoint(buf, 10, &page_shift_compat); if (strcmp(param, "page_shift") != 0)
return 0;
ret = kstrtoint(val, 10, &page_shift_compat);
if (ret) if (ret)
return ret; return ret;
@@ -45,7 +50,20 @@ static int __init early_page_shift_compat(char *buf)
return 0; return 0;
} }
early_param("page_shift", early_page_shift_compat);
static int __init init_page_shift_compat(void)
{
char *err;
err = parse_args("page_shift", saved_command_line, NULL, 0, 0, 0, NULL,
page_shift_params);
if (IS_ERR(err))
return -EINVAL;
return 0;
}
pure_initcall(init_page_shift_compat);
static int __init init_mmap_rnd_bits(void) static int __init init_mmap_rnd_bits(void)
{ {