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um: Centralize stub size calculations

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Currently, the stub size is calculated in multiple places. Define
a macro that performs the calculation so that the code is easier
to read and maintain.

Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Tiwei Bie
2025-08-27 08:57:03 +08:00
committed by Johannes Berg
parent b765d69a1a
commit e047f9af9d
4 changed files with 5 additions and 6 deletions
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3
arch/um/include/shared/as-layout.h
View File

@@ -24,7 +24,8 @@
#define STUB_CODE STUB_START
#define STUB_DATA (STUB_CODE + UM_KERN_PAGE_SIZE)
#define STUB_DATA_PAGES 2
#define STUB_END (STUB_DATA + STUB_DATA_PAGES * UM_KERN_PAGE_SIZE)
#define STUB_SIZE ((1 + STUB_DATA_PAGES) * UM_KERN_PAGE_SIZE)
#define STUB_END (STUB_START + STUB_SIZE)
#ifndef __ASSEMBLER__

4
arch/um/kernel/um_arch.c
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@@ -331,9 +331,7 @@ int __init linux_main(int argc, char **argv, char **envp)
host_task_size = get_top_address(envp);
/* reserve a few pages for the stubs */
stub_start = host_task_size - STUB_DATA_PAGES * PAGE_SIZE;
/* another page for the code portion */
stub_start -= PAGE_SIZE;
stub_start = host_task_size - STUB_SIZE;
host_task_size = stub_start;
/* Limit TASK_SIZE to what is addressable by the page table */

2
arch/x86/um/shared/sysdep/stub_32.h
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@@ -129,7 +129,7 @@ static __always_inline void *get_stub_data(void)
"subl %0,%%esp ;" \
"movl %1, %%eax ; " \
"call *%%eax ;" \
:: "i" ((1 + STUB_DATA_PAGES) * UM_KERN_PAGE_SIZE), \
:: "i" (STUB_SIZE), \
"i" (&fn))
static __always_inline void

2
arch/x86/um/shared/sysdep/stub_64.h
View File

@@ -133,7 +133,7 @@ static __always_inline void *get_stub_data(void)
"subq %0,%%rsp ;" \
"movq %1,%%rax ;" \
"call *%%rax ;" \
:: "i" ((1 + STUB_DATA_PAGES) * UM_KERN_PAGE_SIZE), \
:: "i" (STUB_SIZE), \
"i" (&fn))
static __always_inline void