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x86/xen: add prototypes for paravirt mmu functions

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The paravirt MMU functions called via the PV_CALLEE_SAVE_REGS_THUNK()
macro can't be defined to be static, as the macro is generating a
function via asm() statement calling the paravirt MMU function.

In order to avoid warnings when specifying "-Wmissing-prototypes" for
the build, add local prototypes (there should never be any external
caller of those functions).

Reported-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20230614073501.10101-2-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross
2023-06-14 09:35:00 +02:00
parent 9338c2233b
commit 3d013424de
1 changed files with 16 additions and 0 deletions
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16
arch/x86/xen/mmu_pv.c
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@@ -86,6 +86,22 @@
#include "mmu.h"
#include "debugfs.h"
/*
* Prototypes for functions called via PV_CALLEE_SAVE_REGS_THUNK() in order
* to avoid warnings with "-Wmissing-prototypes".
*/
pteval_t xen_pte_val(pte_t pte);
pgdval_t xen_pgd_val(pgd_t pgd);
pmdval_t xen_pmd_val(pmd_t pmd);
pudval_t xen_pud_val(pud_t pud);
p4dval_t xen_p4d_val(p4d_t p4d);
pte_t xen_make_pte(pteval_t pte);
pgd_t xen_make_pgd(pgdval_t pgd);
pmd_t xen_make_pmd(pmdval_t pmd);
pud_t xen_make_pud(pudval_t pud);
p4d_t xen_make_p4d(p4dval_t p4d);
pte_t xen_make_pte_init(pteval_t pte);
#ifdef CONFIG_X86_VSYSCALL_EMULATION
/* l3 pud for userspace vsyscall mapping */
static pud_t level3_user_vsyscall[PTRS_PER_PUD] __page_aligned_bss;