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nvmap: Implement nvmap_page_mapcount()

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Upstream commit cdd9a571b7d8 ("fs/proc: move page_mapcount() to
fs/proc/internal.h") made page_mapcount() an internal function for Linux
v6.11. This function is used by the NVMAP driver and so implement this
function in the NVMAP driver directly instead. Note that newer kernels
implement folio_entire_mapcount() for compound page counts where as
older kernels use compound_mapcount(). Use conftest to detect which of
these functions is present in the kernel.

Bug 4749580

Change-Id: I6504448727d6b3e9f2caa8581a66aad464ae2426
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3180097
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Jon Hunter
2024-06-19 16:26:26 +01:00
committed by mobile promotions
parent d71b21ebb9
commit f327656ea3
3 changed files with 41 additions and 4 deletions
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1
scripts/conftest/Makefile
View File

@@ -123,6 +123,7 @@ NV_CONFTEST_FUNCTION_COMPILE_TESTS += ethtool_kernel_ethtool_ts_info_struct_pres
NV_CONFTEST_FUNCTION_COMPILE_TESTS += ethtool_ops_get_set_coalesce_has_coal_and_extack_args
NV_CONFTEST_FUNCTION_COMPILE_TESTS += ethtool_ops_get_set_ringparam_has_ringparam_and_extack_args
NV_CONFTEST_FUNCTION_COMPILE_TESTS += ethtool_ops_get_set_rxfh_has_rxfh_param_args
NV_CONFTEST_FUNCTION_COMPILE_TESTS += folio_entire_mapcount
NV_CONFTEST_FUNCTION_COMPILE_TESTS += genpd_xlate_t_has_const_of_phandle_args
NV_CONFTEST_FUNCTION_COMPILE_TESTS += get_file_rcu_has_double_ptr_file_arg
NV_CONFTEST_FUNCTION_COMPILE_TESTS += get_user_pages

18
scripts/conftest/conftest.sh
View File

@@ -7193,6 +7193,24 @@ compile_test() {
"NV_ETHTOOL_OPS_GET_SET_RXFH_HAS_RXFH_PARAM_ARGS" "" "types"
;;
folio_entire_mapcount)
#
# Determine if function folio_entire_mapcount() is present.
#
# Commit 74e8ee4708a8 ("mm: Turn head_compound_mapcount() into
# folio_entire_mapcount()") add folio_entire_mapcount() in Linux
# v5.18.
#
CODE="
#include <linux/mm.h>
int conftest(void)
{
return folio_entire_mapcount();
}"
compile_check_conftest "$CODE" "NV_FOLIO_ENTIRE_MAPCOUNT_PRESENT" "" "functions"
;;
genpd_xlate_t_has_const_of_phandle_args)
#
# Determine if genpd_xlate_t function pointer has a